A Dual-Band Bandpass Mode-Composite Cavity Filter With Large Frequency Ratio

A novel dual-mode-composite (DMC) cavity resonator is proposed. The DMC cavity is fulfilled based on a rectangular waveguide (RW) cavity by introducing an array of periodic metallic pins into it. Benefiting the introduced periodic metallic pins, the electromagnetic band-gap structures (EBGs) are formed in the DMC cavity and two TE
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-like modes are excited in it. By cascading the DMC cavity resonators, a dual-band filter is designed with three millimeter-wave (mm-wave) band filtering channels and one microwave-band filtering channel.